JPH05337708A - Chuck device - Google Patents

Abstract

PURPOSE: To quickly align a restraint workpiece end to a rotating shaft of a face plate without stopping the face plate even in a small structure by improving the chuck device for restraining a workpiece by a face plate of a cutting machine. CONSTITUTION: A face plate 3 has a ring gear 27 which is driven by a transmission motor 29 and disposed concentrically, and by the ring gear 27, each reduction gear transmission formed as a planetary gear transmission of the respective chuck spindles 19, 20, 21, 22 is driven through one gear 35, a first shaft, a clutch, a second shaft and a bevel gear transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chucking device for holding a workpiece with a face plate of a cutting machine, wherein the face plate is formed with a large number of guides arranged to be displaced in the radial direction. One slidable chuck claw and one drivable chuck spindle are assigned to each of these guides, and each one slidable chuck claw and associated chuck spindle form one screw transmission. And each chuck spindle is provided with one reduction gear transmission.

[0002]

[Prior Art] Federal Republic of Germany Utility Model Registration No. 751
3845 discloses a mechanical chucking device for tools, especially in face plates of large machine tools.

This known chuck device has a first rotary drive device for rotating the chuck spindle and a second rotary drive device for sliding the chuck spindle in its longitudinal direction. .. The first rotary drive is used to apply the chuck jaws to the workpiece, while the second rotary drive is used to generate a large clamping force. In order to generate a large tightening force with a small torque, in this known chuck device an angle lever device is provided between the rotary member and the chuck spindle, which acts as a speed reduction transmission.
If a correspondingly large torque is applied to a rotating sleeve fixed to the chuck spindle in a non-rotatable manner (rotatable together with the chuck spindle), the first rotary drive can generate a correspondingly large clamping force. You can However, in order to introduce a large torque to the rotating sleeve, a driving device having a large structure is required.

German Patents 151693, 3991 and 2068 disclose a face plate for a cutting machine.
On the face plate, the sliding of each slidable chuck pawl is only possible manually over a long period of time. The known structure of the face plate corresponds to the structure of the rotary drive device disclosed in the above-mentioned German Utility Model Registration No. 7513845.

Federal Republic of Germany Utility Model Registration No. 7735
The face plate in the form of a three-jaw chuck disclosed in the '088 specification differs from that which is the subject of the present invention, since the three spindles cannot be driven individually. The same is also true of the faceplate with one central chuck system (German magazine "Maschinenmarkt" 1990 Year, N
o.38, p. 50 and p. 51)).

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to improve a chuck device provided on a face plate of a cutting machine of the type described at the beginning so that the face plate can be stopped with a small structure. The arrangement is such that the clamped work piece end can be quickly aligned with the axis of rotation of the face plate.

[0007]

According to the structure of the present invention which has solved this problem, the face plate has a concentrically arranged ring gear driven by a transmission motor, and the ring gear allows Each reduction gear transmission of the chuck spindle, which is configured as a planetary gear transmission, is driven via a gear, a first shaft, a clutch, a second shaft and a bevel gear, respectively. ing.

Further features of the invention are set forth in claims 2-5.

[0009]

By constructing the chuck device provided on the face plate of the cutting machine as in the present invention, the structure of the drive device of the chuck device is particularly small, and the face plate can be tightened without stopping. The advantage is that the machined workpiece edge can be quickly aligned with the axis of rotation of the face plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described in detail with reference to the embodiments shown in the drawings.

A headstock 1 of a printing machine has a main shaft 2 which is rotatably supported, and a face plate 3 is fixed to a front portion of the main shaft 2.

The rotary movement of the main shaft 2 or the face plate 3 is produced by the main drive device 4. This main drive 4
It comprises a motor 5, a belt transmission 6, two connectable planetary gears 7, 8, a clutch 9 and a disc brake 10.

The face plate 3 has one chuck claw 15 and one chuck claw 1 respectively.
Four guides 11, 12, 13, 1 arranged in a staggered manner for guiding 6, 17, 18 in the radial direction
Have four.

The chuck claws 15, 16, 17, and 18 are
It has a concentrically arranged hydrostatic ring gear 27, which is provided with an external toothing 28.

The ring gear 27 is driven by a stationary transmission motor 29 via a coupling 30 which can be connected and disconnected, a shaft 31 and a gear 32 which is engaged in the external tooth row 28. ing.

The transmission motor 29 has a headstock casing 33.
It is fixed to a bracket 34, which is screwed to it, so that it is placed stationary. The ring gear 27 is
It is connected to each chuck spindle 19, 20, 21, 22 via a gear 35 and a transmission 36, which can be connected and disconnected, respectively. In this embodiment, four identical gears 35 and four identical transmissions 3
6 and 6 are used.

Each transmission 36 has two shafts 37, 38,
One clutch 39 and one bevel gear transmission 40 and 2
It has two planetary gear transmissions 41 and 42.

As long as the rotation speed of the ring gear 27 is lower than or higher than the rotation speed of the face plate 3, when the clutch 30 is connected and all four transmission devices 36 are connected, the transmission motor 29 includes all four. Chuck jaws 15,
Work to shift 16, 17, and 18 at the same time.

The transmission motor 29 has one chuck claw 15
Or, if you want to shift only 16 or 17 or 18, you do not need to shift the chuck jaws 16, 17, 18 or 15,
17,18 or 15,16,18 or 15,16,17
The three transmissions 36 for are disconnected.

In order to be able to manually shift the chuck jaws 15, 16, 17, 18 one drive pin 43 is provided for each of the four transmissions 36.

The clamping of the workpiece end 44 is carried out by the chuck jaws 15, 16, 17, 18 while the face plate 3 is stopped.

In this case, the center 45 of the workpiece end 44
Cannot be immediately aligned with the axis of rotation 46 of the spindle 2 or face plate 3, so that the clamped workpiece end 44
Need to be aligned.

The task of aligning the clamped work piece end 44 with the axis of rotation 46 of the spindle 2 or face plate 3 may be defined by an instrument (not shown) when the face plate 3 is rotating. The eccentricity of the end portion 44 is eliminated by slightly displacing the two chuck claws 15, 17 and / or 16, 18 facing each other.

[Brief description of drawings]

FIG. 1 is a partial schematic view showing the contour of a headstock of a cutting machine provided with a face plate.

FIG. 2 is an enlarged view of a portion A of FIG.

FIG. 3 III-II of FIG. 1 with the face plate in another position
It is sectional drawing which followed the I line.

[Explanation of symbols]

1 headstock, 2 spindle, 3 face plate, 4 main drive device, 5 motor, 6 belt transmission device, 7,8 planetary gear device, 9 clutch, 10 disc brake, 11, 12, 13, 14 guide, 15, 1
6, 17, 18 chuck claws, 19, 20, 21, 22
Chuck spindle, 23, 24, 25, 26 Screw transmission device, 27 Ring gear, 28 External tooth row,
29 transmission motors, 30 clutches, 32 gears, 3
3 Headstock casing, 34 Bracket, 35
Gears, 36 transmissions, 37, 38 shafts, 39 transmissions, 40 bevel gear transmissions, 41, 42 planetary gear transmissions, 43 drive pins, 44 workpiece ends, 45 center, 46 rotation axes

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Klaus Schmitz, Germany 60 Dortmund 70 Rudolf Weg 2

Claims (5)

[Claims] 1. A chuck device for tightening a workpiece with a face plate of a cutting machine, wherein the face plate is formed with a large number of guides arranged in a radial offset manner. One slidable chuck jaw and a drivable chuck spindle are assigned, each one slidable chuck jaw and associated chuck spindle form one screw transmission, each chuck In the type in which one reduction gear transmission is arranged on each spindle, the face plate (3) has concentrically arranged ring gears (27) driven by a transmission motor (29). , The chuck gears (19, 20, 21, 2) by the ring gear (27).
Each reduction gear transmission of 2) configured as a planetary gear transmission (41, 42) has one gear (3
5), a first shaft (37), a clutch (39), a second shaft (38), and a bevel gear transmission (40). apparatus. 2. The chuck device according to claim 1, wherein the ring gear (27) is hydrostatically supported. 3. The chuck device according to claim 1, wherein the ring gear (27) is provided with an external tooth row (28). 4. The chuck device according to claim 1, wherein the transmission motor (29) is arranged stationary. 5. The transmission motor (29) comprises a coupling (30) which can be connected and disconnected.
The chuck device according to any one of 1 to 6 above.